On the three hundredth anniversary of the Stewards' Reckoning, the calendar introduced by his ancestor Mardil Voronwë, Hador added an extra day to the year T.A.2360. This was done to reduce the millennial deficit, thus keeping the calendar in synchronization with the seasons.[2]

Hador ruled Gondor for one hundred and seventeen years, and was succeeded by his son Barahir.[3] Hador was the last Gondorian to live 150 years and after his time the life-span of those with Númenórean blood waned more rapidly.[4]